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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"/>
    <title>Document</title>
    <script src="./js/main.js"></script>
</head>
<body>
    <div id="show">test</div>
    <button data-id="test1">test1</button>
    <button data-id="test2">test2</button>
    <button data-id="test3">test3</button>